CVE-2026-63623

Name	CVE-2026-63623
Description	A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libvirt (PTS)	bullseye	7.0.0-3+deb11u3	vulnerable
	bullseye (security)	7.0.0-3+deb11u4	vulnerable
	bookworm	9.0.0-4+deb12u2	vulnerable
	trixie	11.3.0-3+deb13u2	vulnerable
	forky, sid	12.6.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libvirt	source	(unstable)	12.6.0-1

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2513066
Fixed by: https://gitlab.com/libvirt/libvirt/-/commit/69335a484768d550854da1133d5490074695e825 (v12.6.0-rc2)